diff --git a/rust-no-heap/src/lib.rs b/rust-no-heap/src/lib.rs
index 59a2b96..20202a5 100644
--- a/rust-no-heap/src/lib.rs
+++ b/rust-no-heap/src/lib.rs
@@ -90,6 +90,7 @@
 
 
 #![no_std]
+#![forbid(unsafe_code)]
 use core::convert::TryFrom;
 
 
diff --git a/rust/src/lib.rs b/rust/src/lib.rs
index 60f1d29..5f26b25 100644
--- a/rust/src/lib.rs
+++ b/rust/src/lib.rs
@@ -85,6 +85,7 @@
 //! ```
 
 
+#![forbid(unsafe_code)]
 use std::convert::TryFrom;